Question

explain about low temperature tempering medium temperature tempering, high temperature tempering​

Answer 1

Explanation:

Low-temperature tempering in the temperature range of 150–200 ◦C is applied to ultrahigh-strength carbon steels with a medium carbon content, as it usually provides a significant improvement of impact toughness without drastically decreasing hardness and tensile strength

Answer 2

Low-temperature physics is also known as cryogenics, from the Greek meaning "producing cold." Low temperatures are achieved by removing energy from a substance. ... Various liquefied gases can be used in this manner to cool a substance to as low as 4.2°K, the boiling point of liquid helium.